Epitaxial Growth and Optical Properties of Laser Deposited CdS Thin Films

Abstract

In this study, cadmium Sulfide (CdS) thin films were synthesized on quartz substrates using an infrared pulsed laser deposition (IR-PLD) technique under high vacuum (~10−6 Torr) conditions. X-ray diffraction was used to evaluate the structural features. According to X-ray analysis, the deposited CdS films are crystalline and have a favored orientation on a plane (110) of an orthorhombic. The peak intensity and the average crystallite size increases with increasing the film thickness. After annealing at 300 °C, the orthorhombic phase transformed into a predominant hexagonal phase and the same result was obtained by SEM photographs as well. Spectrophotometric measurements of transmittance and reflectance of the CdS films were used to derive optical constants (n, k, and absorption coefficient α). The optical band gap energy was found to be 2.44 eV. The plasma plume formation and expansion during the film deposition have also been discussed. The photocurrent response as a function of the incident photon energy E (eV) at different bias voltages for different samples of thicknesses (85, 180, 220 and 340 nm) have been studied, indicating that the photocurrent increases by increasing both the film thickness and photon energy with a peak in the vicinity of the band edge. Thus, the prepared CdS films are promising for application in optoelectronic field.

Effect of Multilayers CdS Nanocrystalline Thin Films on the Performance of Dye-Sensitized Solar Cells

“…Te performance of various thicknesses of CdS without a MB sensitizer has been studied, and the short circuit current density J SC increases with increasing the thickness, reaching 0.462 mA/cm 2 with a power conversion efciency of 0.018% for FTO/3 layer CdS/electrolyte/carbon/FTO device, as shown in Figure 7(a). Gadalla et al [37] studied the infuence of increasing the thickness of CdS thin flms on the output photocurrent, and they found that an increment in the photocurrent with increased thickness. Other researchers the results by increasing the thickness which agrees with [38][39][40].…”

Production and Characterization of Electrodeposited Cadmium Sulfide Semiconductor Films with Different Boron Content

“…[6] CdS films are used as window materials in heterojunction solar cells because of their wide bandgap, high transmittance, and low-cost techniques. Research indicated that CdS thin films have been produced by different deposition techniques, such as; evaporation, [7] RF sputtering, [8] spray pyrolysis, [9] chemical bath, [10] pulsed laser deposition [11] and electrodeposition. [12] Within these deposition techniques, electrodeposition is considered one of the low-cost methods for semiconductor thin film fabrication.…”